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    <a href="/2018/09/05/sort/选择排序(SelctionSort)/" class="article-date">
  <time datetime="2018-09-05T04:39:46.000Z" itemprop="datePublished">2018-09-05</time>
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      选择排序(SelctionSort)
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<table>
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<th>排序算法</th>
<th>时间复杂度</th>
</tr>
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<tbody>
<tr>
<td>冒泡排序</td>
<td>O(n2)</td>
</tr>
<tr>
<td>选择排序</td>
<td>O(n2)</td>
</tr>
<tr>
<td>插入排序</td>
<td>O(n2)</td>
</tr>
<tr>
<td>希尔排序</td>
<td>O(n1.5)</td>
</tr>
<tr>
<td>快速排序</td>
<td>O(N*logN)</td>
</tr>
<tr>
<td>归并排序</td>
<td>O(N*logN)</td>
</tr>
<tr>
<td>堆排序</td>
<td>O(N*logN)</td>
</tr>
<tr>
<td>基数排序</td>
<td>O(d(n+r))</td>
</tr>
</tbody>
</table>
<h5 id="选择排序-SelctionSort"><a href="#选择排序-SelctionSort" class="headerlink" title="选择排序(SelctionSort)"></a>选择排序(SelctionSort)</h5><ul>
<li><p>基本思想：<br>在长度为N的无序数组中，第一次遍历n-1个数，找到最小的数值与第一个元素交换；<br>第二次遍历n-2个数，找到最小的数值与第二个元素交换；<br>。。。<br>第n-1次遍历，找到最小的数值与第n-1个元素交换，排序完成。</p>
</li>
<li><p>平均时间复杂度：O(n2)</p>
</li>
</ul>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">select_sort</span><span class="params">(<span class="keyword">int</span> array[],<span class="keyword">int</span> lenth)</span></span>&#123;</span><br><span class="line"></span><br><span class="line">   <span class="keyword">for</span>(<span class="keyword">int</span> i=<span class="number">0</span>;i&lt;lenth-<span class="number">1</span>;i++)&#123;</span><br><span class="line"></span><br><span class="line">       <span class="keyword">int</span> minIndex = i;</span><br><span class="line">       <span class="keyword">for</span>(<span class="keyword">int</span> j=i+<span class="number">1</span>;j&lt;lenth;j++)&#123;</span><br><span class="line">          <span class="keyword">if</span>(array[j]&lt;array[minIndex])&#123;</span><br><span class="line">              minIndex = j;</span><br><span class="line">          &#125;</span><br><span class="line">       &#125;</span><br><span class="line">       <span class="keyword">if</span>(minIndex != i)&#123;</span><br><span class="line">           <span class="keyword">int</span> temp = array[i];</span><br><span class="line">           array[i] = array[minIndex];</span><br><span class="line">           array[minIndex] = temp;</span><br><span class="line">       &#125;</span><br><span class="line">   &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
      
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